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English definition of “attrition”

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attrition

noun [U] uk   /əˈtrɪʃ.ən/ us  
formal gradually making something weaker and destroying it, especially the strength or confidence of an enemy by repeatedly attacking it: Terrorist groups and the government have been engaged in a costly war of attrition since 2008. US ( UK natural wastage) business a reduction in the number of people who work for an organization that is achieved by not replacing those people who leave US ( UK wastage) the people who leave an educational or training course before it has finished: The high attrition rates on the degree programs are a cause for concern.
(Definition of attrition from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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